UIDatePicker

UIDatePicker：是一個(gè)控制器類壤圃，封裝了 UIPickerView是辕，但是他是UIControl的子類汁展，專門用于接受日期私蕾、時(shí)間和持續(xù)時(shí)長的輸入僵缺。日期選取器的各列會(huì)按照指定的風(fēng)格進(jìn)行自動(dòng)配置，這樣就讓開發(fā)者不必關(guān)心如何配置表盤這樣的底層操作踩叭。你也可以對其進(jìn)行定制磕潮，令其使用任何范圍的日期。
UIDatePicker初始化：

UIDatePicker *datePicker = [[UIDatePicker alloc]initWithFrame:CGRectMake(30, 300, 0, 0)];
[datePicker addTarget:self action:@selector(dateChange:) forControlEvents:UIControlEventValueChanged];//添加觸發(fā)事件
[self.view addSubview:datePicker];

UIDatePicker常用設(shè)置

setLocale:設(shè)置地區(qū)
[datePicker setLocale:[[NSLocale alloc]initWithLocaleIdentifier:@"zh_CN"]];

setCalendar:設(shè)置datePicker的日歷(默認(rèn)為當(dāng)天)
[datePicker setCalendar:[NSCalendar currentCalendar]];

setDatePickerMode:設(shè)置時(shí)間模式,默認(rèn)UIDatePickerModeDateAndTime
[datePicker setDatePickerMode:UIDatePickerModeDate];

setCountDownDuration:設(shè)置倒計(jì)時(shí)的秒數(shù)
[datePicker setCountDownDuration:2*60];

setTimeZone:設(shè)置時(shí)區(qū)
[datePicker setTimeZone:[NSTimeZone localTimeZone]];

設(shè)置最大，最小日期

//設(shè)置一個(gè)時(shí)間戳
NSTimeInterval timeInterval = 60;
NSDate *minDate = [[NSDate alloc]initWithTimeIntervalSinceNow:-timeInterval];
NSDate *maxDate = [[NSDate alloc]initWithTimeIntervalSinceNow:timeInterval];
//設(shè)置最大斤富，最小日期
datePicker.minimumDate = minDate;
datePicker.maximumDate = maxDate;

設(shè)置分鐘間隔
datePicker.minuteInterval = 5;

取出日期
NSDate *select = datePicker.date;

UIPickerView

//初始化一個(gè)pickerView
UIPickerView *pickerView = [[UIPickerView alloc] initWithFrame:CGRectMake(0, 436, 414, 300)];
//設(shè)置背景色
pickerView.backgroundColor = [UIColor whiteColor];
//設(shè)置代理
pickerView.delegate = self;
pickerView.dataSource = self;
[self.view addSubView:pickerView];```

##UIPickerViewDataSource代理方法
-numberOfComponentsInPickerView:設(shè)置列的返回?cái)?shù)量（必須實(shí)現(xiàn)）

• (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
  {
  return 3;
  }```

-pickerView:numberOfRowsInComponent:設(shè)置列里邊組件的個(gè)數(shù) component:組件（必須實(shí)現(xiàn)）

- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
    //如果是第一列
    if (component == 0)
    {
        return 10;
    }
    //如果是第二列
    else if (component == 1)
    {
        return 5;
    }
    else
    {
        return 3;
    }
}```

##UIPickerViewDelegate代理方法
返回組件的標(biāo)題：有三個(gè)方法都可以用膏潮，不同方法的返回值不同

• (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {
  if (component == 0) {
  return @"第一列";
  } else if (component == 1) {
  return @"第二列";
  } else {
  return @"第三列";
  }
  }```

pickerView:didSelectRow:inComponent:選擇器選擇的方法 row：被選中的行

    //選擇第一列執(zhí)行的方法
    if (component == 0) {
           NSLog(@"1");
     }
    //選擇第二列執(zhí)行的方法
    else if (component == 1) {
          NSLog(@"2");
    }
   else {
          NSLog(@"3");
    }
}```

pickerView:widthForComponent:設(shè)置組件的寬度

• (CGFloat)pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger)component
  {
  if (component == 0) {
  return 100;
  } else if (component == 1) {
  return 200;
  } else {
  return 100;
  }
  }```

pickerView:rowHeightForComponent:設(shè)置列里邊組件的高度

- (CGFloat)pickerView:(UIPickerView *)pickerView rowHeightForComponent:(NSInteger)component
{
    if (component == 0) {
        return 20;
    } else if (component == 1) {
        return 25;
    } else {
        return 30;
    }
}```